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(No mo e J T. TULLIS'. COTTON SEE D GRINDER ,259. Patented Aug 15,1893.

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UNITED STATES PATENT OFFICE.

JOHN T. TULLIS, OF CHIP, ARKANSAS, ASSIGNOR or ONE-HALE TO JOHN BURRESS,or SAME PLACE.

COTTOIfl-SEED GRINDER.

SPECIFICATION forming part of Letters Patent No. 503,259, dated August15, 1893.

Application filed October 28, 1892'.

To all whom it may concern.-

Be it known that I, JOHN T. TULLIs, a citizen of the United States,residing at Chip, in the county of Union and State of Arkansas, haveinvented a new and useful Cotton-Seed Grinder, of which the following isa specification.

My invention relates to improvements in machines for grinding cottonseed, grain, feed, &e., and the objects in view are to provide a deviceembodying simplicity of construction and operation, thereby enabling themachine to be cheaply manufactured, and providing for durability andefiectiveness of operation; and furthermore, my object is to providemeans whereby the rotary grinder may yield considerably to the pressurebetween the grinders without disarranging the parts or allowing theescape of the seed orgrain; and furthermore, my object is to providemeans for allowinga yielding pressure of the revoluble grinder withoutextending the spindle of the latter through the space between thegrinders.

Further objects and advantages of my invention will appear in thefollowing description and the novel features thereof will beparticularly pointed out in the appended claims.

In the drawings; Figure l is a perspectiveview of a machine embodying myinvention. Fig. 2 is a central longitudinal section of the same. Fig. 3is a face view of the stationary grinder.

A represents the frame-work .of the machine, which is preferably made ofwood, but may be cast, the same being approximately rectangular in formand comprising the sidebars, a a, and the end-bars, a a, and having anintermediate cross-bar, a", parallel with the end-bars.

Arranged adjacent to one of the end-bars is the stationary grinder, B,provided with the usual interior grinding face and having a forwardprojecting peripheral flange or shell, 0. This flange or shell iscutaway or recessed at the top to form an opening 0, with which thesuperimposed hopper communicates, and is similarly recessed or cut awayat the bottom to provide an outlet 0'. In bearings in the op- SerialN0.450.212. No model.)

posite sides of the hopper, D, is mounted the agitator-shaft, E,carrying the agitator-arms, e e, and the beltv pulley, F.

G represents the rotary grinder, coextensive with the stationary grinderand normally held in contact with the free edge of the peripheral flangeor shell thereof, this grinder, G, being provided upon its inner facewith a reduced core, or cheek, H, which is equal in diameter with theinterior of the flange or shell and fits therein, so that its surface isbrought close to the surface of the Stationary grinder when theshoulder, h, which is formed between the body of the grinder and itsreduced core or cheek, is in contact with the free edge of the flange orshell.

The horizontal spindle, K, which is attached at one end to the center ofthe rotary grinder is mounted in bearings upon the intermediatecross-bar and the end-bar of the frame whereby the grinder is held toits place without the necessity of passing the spindle through thegrinders. The front end of the spindle, namely, that end which is remotefrom the grinder, is fitted in a box, L,in which is arranged a pressurespring, M, whereby the shaft is normally pressed rearward and the rotarygrinder is held firmly in contact with the material which is beingground. The spindle carries a belt pulley, N.

The faces of the grinders of stones are roughened or broken in the usualand wellknown manner, and that of the stationary grinder or stone isrecessed radially, above and below its center, as shown at b 17.

From the above description taken in connection with the drawings it willbe evident that the construction of my improved grinding machine issimple and direct, and it will also be not-iced that by reason of theofi-set or reduced core or cheek with which the inner surface of therotary grinder is provided the latter may be repressed, against thetension of the pressure spring, a considerable distance withoutdisplacing any of the parts of the mechanism or exposing the grindingsurface, which is formed upon said ofi-set, core or check.

It willbe understood that the radial recesses 12 and b whichrespectively serve as an inlet mo and an outlet for the grain or seed,may be made of any desired length to suit the material and the purposefor which the device is designed. In the drawings, Figs. 2 and 3, I haveshown such recesses extending to within a short distance of the centerof the stationary grinder or stone, thus being suitable for grain whichis sufficiently large to prevent its passage across the interveningportion of the stone between the inlet recess and the outlet recess, butin practice, the inlet recess may be made as much shorter than theradius of the grinder as may be found desirable.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1.v In a machine of the class described, the

combination with a stationary grinder, of a f peripheral flange or shellfixed to the stationary grinder, a rotary grinder adapted to bearagainst the free edge of said flange or shell and provided with areduced core or cheek to fit within the flange or shell and carrying theopposite grinding surface, and a spindle cari rying the rotary grinderand fixed to the outer side thereof whereby the grinding surfaces areunbroken, substantially as specified.

2. In a machine of the class described, the combination with theframe-work, of the stationary grinder provided with a forward projectingperipheral flange or shell, the super- 5 imposed hopper communicatingwith an open- ;ing in said flange or shell, the rotary grinder providedwith a reduced core or cheek to fit y within said flange or shell andhavinga shoulid'er, h. to bear against the edge of the same, the spindleattached to and terminating in the center of the rotary grinder, wherebythe l grinding surfaces are unbroken, and the pressure spring engagingthe spindle to press the rotary grinder toward the stationary grinder,substantially as specified.

In testimony that I claim the foregoing as my own I have hereto aifixedmy signature in the presence of two witnesses.

JOHN T. TULLIS.

Witnesses:

Y. F. Goonwm,

STERLING S. LACY.

